As is usually the case with anything that was fun, the design is templated. Every team (except the Giants! Way to go, you be you!) with the same shade of green, the same patch on the side of the cap, and their usual cap logo re-coloured to match the colour scheme.

In addition to the on-field designs there are some t-shirts and hoodies which were created for the holiday, some are listed as part of the “MLB Authentic Collection” (like the first two t-shirts below), and others are retail-only:

If you want to spend green to get green, you can do so now on the official MLB site, if you order it now perhaps it’ll arrive in time for you to Sham-rock it on March 17.